When is the maximum pressure attained within the cylinder?

When is the maximum pressure attained within the cylinder?

• A. When combustion is complete.
• B. At the end of the compression stroke.
• C. During the period of valve overlap.
• D. When combustion temperature is at a minimum.

Answer: (A)

The maximum pressure within the cylinder is reached when combustion is complete. At this point, the fuel-air mixture has fully ignited and the rapid expansion of gases due to the high temperature and pressure from the combustion process generates the highest pressure in the cylinder. This stage is critical because it directly influences the engine's performance and efficiency. Proper timing and complete combustion are essential to ensure that the pressure is maximized for optimal power output. During the end of the compression stroke, while the pressure is indeed high due to compression, it does not reach its peak until after combustion occurs. Similarly, during valve overlap, both intake and exhaust valves are open, which does not create optimal conditions for maximum pressure. Lastly, combustion temperature being at a minimum would not lead to maximum pressure; rather, it's the high temperature from complete combustion that contributes to the peak pressure.

The maximum pressure within the cylinder is reached when combustion is complete. At this point, the fuel-air mixture has fully ignited and the rapid expansion of gases due to the high temperature and pressure from the combustion process generates the highest pressure in the cylinder. This stage is critical because it directly influences the engine's performance and efficiency. Proper timing and complete combustion are essential to ensure that the pressure is maximized for optimal power output.

During the end of the compression stroke, while the pressure is indeed high due to compression, it does not reach its peak until after combustion occurs. Similarly, during valve overlap, both intake and exhaust valves are open, which does not create optimal conditions for maximum pressure. Lastly, combustion temperature being at a minimum would not lead to maximum pressure; rather, it's the high temperature from complete combustion that contributes to the peak pressure.